Hot-blast stove.



M. A. NEELAND. HOT BLAST STOVE.

r APPLICATION FILED OCT 19, 1912- 1,12 .83

2 SHEETS-SHEET I.

W! I min WITNESSES Patented June 15, 1915.

M. A. NEELAND.

HOT BLAST STOVE.

H APPLICATION FILED OCT-19,1912. 1,142,38 Patented June 15, 1915 2SHEETS-SHEET 2.

WITNESSES MARVIN A. NEELAND, 0F MONTCLAIR, NEW JERSEY.

HOT-BLAST srovn.

Specification of Letters Patent.

Patented June 15, 1915..

Application filed October 19, 1912. Serial No. 726,766.

To all whom it may concern: Be it known that I, MARVIN A. NEELAND, acitizen of the United States, residing in Montclair, New Jersey, haveinvented new and useful Improvements in Hot- Blast Stoves, of which thefollowing is a specification.

This invention relates to hot blast stoves such as are used for heatingair to be used in blast furnaces, and to other apparatus working on thesame regenerative principle. In these apparatus a checker work of brickis provided throu h which burning gases are passed for a su cient timeto heat them, after which the gas is cut off and the air to be heated ispassed through. The air takes up the heat accumulated in the brick-workand is thereby heated sufliciently for the blast. This operation isrepeated at such intervals as are necessary. The bricks heretofore usedhave had flat or approximately flat faces. In order to secure sufficientstrength they have to be made of a sufficient minimum thickness. Withthis necessary thickness of the bricks there is a considerable volume ofbrickwork which serves little or no use in alternately absorbing andgiving out the heat. That is to say, only a portion of the brick nearthe exposed faces is necessary for the heating operation. The

volume of the brick-work, therefore, is disproportionate to the surfacethereof which is exposed to the burning gas and the air.

This invention remedies the disproportion to a substantial extent byusing bricks which are formed with corrugated faces. The corrugationsare so arran ed as to increase the extent of exposed sur ace withoutdecreasing the volume below that which is necessary for strength.

The accompanying drawings illustrate embodiments of the lnvention.

Figure 1 is a horizontal section of a hot blast stove of the three-passtype. Fig. 2 is a vertical radial section thereof on the line 22 ofFig. 1. Fig. 3 is a section approximately on the line 33 of Fig. 1. Fig.4: is a horizontal section of a hot blast stove of the two-pass type.

In the three-pass type of stove illustrated in Fig. 1 the centralchamber 'A is the combustion chamber. The gas passes upward to the topof this chamber and thence over to an intermediate chamber B; and fromthe bottom of this intermediate chambricks form a continuous line, andthe radial bricks G are arranged as spacers between the circular lines.In the next course, the rad1al bricks G are longer and form continuousradial lines, while the bricks F of the circular lines are shorter andact as spacers between the radial lines of brick.

In both courses the bricks forming circular lines are made graduallysmaller toward the center and 1 are spaced gradually farther away fromeach other toward the center so as to secure roughly uniform areas inthe.

several vertical passages. I

The exposed faces of the circular lines of brick are greater in areathan the exposed faces of the radial lines, and I prefer to apply theimprovement to these circular lines of brick. I have, therefore,corrugated the exposed faces of the bricks in the circular lines,forming two complete corrugations in each brick and designing andarranging the bricks so that the inward proj ection on each one is inradial line with the inward depression on the opposed face of the nextone, and the outward projections and depressions similarly. This resultsin providing a greater length (circularly) of exposed face in each ofthe vertical passages, while maintaining the necessary volume ofbrick-work to support the weights. Or in other words, provides a greaterradiating surface. A stove of this design may be made much smaller thanthe previous standard for securing a given heat effect; orif of the samesize as one of the previous design will provide a greater heatingeffect. The corrugations in the successive horizontal courses arearranged to coincidd with each other asshown in Fig. 3, so as to avoidany obstructlon to the flow of gases or any g3 intense shoulders uponwhich dirt might accumulate. Both of the two intersecting lines ofbrick-work may be made corrugated if de sired. This can be veryconveniently done in the type of stove shown in Fig. 4. Here there is aside combustion chamber A and a segmental heat-interchanging chamber 18,separated from the first by a solid wall of brick-work D. The two linesof bricks F and F? are straight lines, intersecting each other at rightangles. Tn one course the bricks F are longer and abut against eachother so as to form continuous lines, the bricks F forming spacersbetween such lines; and in the nextcourse the long bricks will lie uponthe short bricks of the previous course to form continuous lines, andvice versa. The corrugations are similar to those shown in Fig. 1 andsimilarly arranged to bring. the projections of one brick in line withthe depressions in the opposing face of the next brick. I

The bricks of thefdiii'erent series (circular and radial respectively inFig. 1 or longitudinal and transverse respectivelyin Fig. a have theirends interlocked at the intersections of the two series in the mannerdescribed in order to bond them strongly to gether, and the strength ofthe bond is the greater by reason of the fact that the faces of thecorrugated bricks are made fiat where they contact with the ends of thebricks of the intersecting series,only the exposedfaces beingcorrugated. In Fig. 4 both series of bricks} are made in this way.

Though I have described with great particularity of detail containspecific embodi-- ments of the invention yet it will be understood" thatthe invention is not limited to the particular embodiments disclosed.Various modifications thereof in detail and in the combination of theparts may be made by those skilled in the art without departure from theinvention.

What I claim is:

1. A hot blast stove, the regenerative chamber of which is provided witha brick checker-work with vertical passages for the heating gases andthe air, opposite faces of the brick-work forming said passages beingcorrespondingly corrugated, so that a projection on one face is in linewith thedepression on the opposite face, for the purpose of providing anextended radiating surface in. proportion to the volume of brickwork.

2. A. hot blast stove the regenerative chamber of which is provided withbrick checker-work with vertical passages for the heating gases and theair, said bricks being solid and having corrugated faces. forming saidpassages the projections on one face of a brick being in line with therecesses on its opposite face so as to provide bricks of approximatelyuniform thickness from end to end and to provide an extended radiatingsurface in proportion to the volume of brickwork.

3. A hot blast stove, the regenerative chamber of which is provided witha brick checker-work, the bricks being arranged in horizontal courseswith continuous vertical passages therethrough, the bricks in thesuccessive courses having corrugated faces, with the corrugationsvertical the corrugations in the successive courses being in line witheach other so as to constitute continuous vertical corrugations.

In witness whereof, I have hereunto signed my name in the presence oftwo subscribing witnesses.

1 MARVIN A. NEELAND.

Witnesses:

l). ANTHONY UsINA, Leno S'rn'BnNvoLL.

